What Is Duplex And Super Duplex Stainless Steel?

As a result of differences in their microstructural phases, stainless steels are categorized into various classes. While each class of stainless steel has its own microstructure, stainless steels that belong to the duplex category have a similar microstructure to two other classes, i.e. ferritic and austenitic. In the Duplex Round Bar , austenite and ferrite are mixed microstructures. Due to their equivalent ratio, duplex steels contain both austenite and ferrite in a 50% ratio. Duplex stainless steels can be further divided into three subcategories, one of which is super duplex stainless steel. Due to this, super duplex grades also have dual microstructures. There are very high values for PREN, or pitting resistance equivalent number, in duplex grades. The values range from 22 to 45. It is the super duplex kind of stainless steel that offers the highest corrosion resistance out of all three duplex categories. PRENs for super duplex grades range from 38 to ...